// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "media/renderers/default_renderer_factory.h"

#include <utility>

#include "base/bind.h"
#include "base/memory/ptr_util.h"
#include "base/single_thread_task_runner.h"
#include "build/build_config.h"
#include "media/base/decoder_factory.h"
#include "media/base/media_log.h"
#include "media/filters/gpu_video_decoder.h"
#include "media/renderers/audio_renderer_impl.h"
#include "media/renderers/gpu_video_accelerator_factories.h"
#include "media/renderers/renderer_impl.h"
#include "media/renderers/video_renderer_impl.h"

#if !defined(MEDIA_DISABLE_FFMPEG)
#include "media/filters/ffmpeg_audio_decoder.h"
#if !defined(DISABLE_FFMPEG_VIDEO_DECODERS)
#include "media/filters/ffmpeg_video_decoder.h"
#endif
#endif

#if !defined(MEDIA_DISABLE_LIBVPX)
#include "media/filters/vpx_video_decoder.h"
#endif

namespace media {

DefaultRendererFactory::DefaultRendererFactory(
    const scoped_refptr<MediaLog>& media_log,
    DecoderFactory* decoder_factory,
    const GetGpuFactoriesCB& get_gpu_factories_cb)
    : media_log_(media_log)
    , decoder_factory_(decoder_factory)
    , get_gpu_factories_cb_(get_gpu_factories_cb)
{
}

DefaultRendererFactory::~DefaultRendererFactory()
{
}

ScopedVector<AudioDecoder> DefaultRendererFactory::CreateAudioDecoders(
    const scoped_refptr<base::SingleThreadTaskRunner>& media_task_runner)
{
    // Create our audio decoders and renderer.
    ScopedVector<AudioDecoder> audio_decoders;

#if !defined(MEDIA_DISABLE_FFMPEG)
    audio_decoders.push_back(
        new FFmpegAudioDecoder(media_task_runner, media_log_));
#endif

    // Use an external decoder only if we cannot otherwise decode in the
    // renderer.
    if (decoder_factory_)
        decoder_factory_->CreateAudioDecoders(media_task_runner, &audio_decoders);

    return audio_decoders;
}

ScopedVector<VideoDecoder> DefaultRendererFactory::CreateVideoDecoders(
    const scoped_refptr<base::SingleThreadTaskRunner>& media_task_runner,
    const RequestSurfaceCB& request_surface_cb,
    GpuVideoAcceleratorFactories* gpu_factories)
{
    // Create our video decoders and renderer.
    ScopedVector<VideoDecoder> video_decoders;

    // Prefer an external decoder since one will only exist if it is hardware
    // accelerated.
    if (gpu_factories) {
        // |gpu_factories_| requires that its entry points be called on its
        // |GetTaskRunner()|.  Since |pipeline_| will own decoders created from the
        // factories, require that their message loops are identical.
        DCHECK(gpu_factories->GetTaskRunner() == media_task_runner.get());

        if (decoder_factory_) {
            decoder_factory_->CreateVideoDecoders(media_task_runner, gpu_factories,
                &video_decoders);
        }
        video_decoders.push_back(
            new GpuVideoDecoder(gpu_factories, request_surface_cb, media_log_));
    }

#if !defined(MEDIA_DISABLE_LIBVPX)
    //video_decoders.push_back(new VpxVideoDecoder());
#endif

#if !defined(MEDIA_DISABLE_FFMPEG) && !defined(DISABLE_FFMPEG_VIDEO_DECODERS)
    video_decoders.push_back(new FFmpegVideoDecoder());
#endif

    return video_decoders;
}

std::unique_ptr<Renderer> DefaultRendererFactory::CreateRenderer(
    const scoped_refptr<base::SingleThreadTaskRunner>& media_task_runner,
    const scoped_refptr<base::TaskRunner>& worker_task_runner,
    AudioRendererSink* audio_renderer_sink,
    VideoRendererSink* video_renderer_sink,
    const RequestSurfaceCB& request_surface_cb)
{
    DCHECK(audio_renderer_sink);

    std::unique_ptr<AudioRenderer> audio_renderer(new AudioRendererImpl(
        media_task_runner, audio_renderer_sink,
        CreateAudioDecoders(media_task_runner), media_log_));

    GpuVideoAcceleratorFactories* gpu_factories = nullptr;
    if (!get_gpu_factories_cb_.is_null())
        gpu_factories = get_gpu_factories_cb_.Run();

    std::unique_ptr<VideoRenderer> video_renderer(new VideoRendererImpl(
        media_task_runner, worker_task_runner, video_renderer_sink,
        CreateVideoDecoders(media_task_runner, request_surface_cb, gpu_factories),
        true, gpu_factories, media_log_));

    return base::MakeUnique<RendererImpl>(
        media_task_runner, std::move(audio_renderer), std::move(video_renderer));
}

} // namespace media
